Mining-drill



(No Model.)

HguBURII.

` I MINING DRILL. No. 30mm. Patented sept. so, w84.

WSE-:E5 'I K alfalfa@ I f @gw/7%? UNITED STATES ICE@y HIRAM C. BURK, OFCLEVELAND, OHIO.

MINING-DRILL.

SPECIFICATION forming part of Letters Patent No. 305,791, datedSeptember 30, 1884. Application filed February 18, 1884. (No model.)

.To a/ZZ whom t` may concern,.-

Be it known that I, Hman C. Bunn, a citizen of the United States,`residing at Cleve land, in the county of Cuyahoga and State of 'Ohio,have invent-edcertain new and useful Improvements in Mining-Drills; andI do declare the following to be a full, clear, and exact descriptionofthe invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to the letters and iigures of referencemarked thereon,which form a part ofthis specification.

My invention relates to mining-machines; and .it consists in the novelconstruction, combination,and arrangement ofthe several parts, as willbe hereinafter described and claimed.

In the drawings, Figure l is a side view. Fig. 2 is an end View of mymachine. Fig. 3 is a detail view of my feed-screw. Fig. 4 is a detailview of one of the operating levers. Fig. 5 is a detail view of thedrill shaft and bit.

The barrel A is threaded internally and provided with lateral trunnionsA', whichare journaled in the bearing-frame B, as shown.

This bearing-frame is provided with a pivot screw or pin, B,whereby itmaybe supported in any suitable form of frame. The feed-screw C isthreaded externally, "and yturns through the threaded barrel Afas shown.This feedscrew is made hollowits full length, to permit the passage oi'the drill-shaft, presently de-V scribed, and is provided near itsforward end with an opening, C, lfor the purpose hereinafter described.This screw C is provided at or near its rear end with two ratchet-disks,D D, set slightly apart to provide a bearing, D', `for theoperating-levers E E. These le# vers are provided on their inner` endswith rings E', which iit the bearing'D and serve as a pivot for thelevers. The adjacent sides of these levers I call, for lconvenience ofreference, the inner sides, and the other ones the outer sides.77 Theseinner sides rest close together, as shown inliig. 1. Handles E2 areprojected laterally from the outer side ci' each of these levers at ornear the swinging ends thereof, as shown. Parvis F are pivoted at oneend on the outer side of these levers, and

have their points arranged to engage the ratchet-disks. In practicethese levers are operated reciprocally by the handles E2. This gives thescrew a continuous revolution, and provides a convenient,easily-operated driving mechanism. I prefer to cast the disk D integralwith the feed-screw. This necessitates the splitting of the rings E', asshown in Fig. et. Where these disks are made separate from the screw andsecured thereto in any suitable manner, this splitting of the ring willnot be required.

It is obvious that a single ratchet-wheel of sufficient breadth might beused and the levers arranged on opposite sides thereof, with their pawlspivoted on the inner face of the levers, as will be understood. Iprefer, however, the construction shown and before described, as therebythe parts are arranged in compact form and the levers are held by theratchet-disks.

My feed-screw, it will be seen, supports its operating devices, whichsimplifies the machine by reducing the framing, as will be. appreciated.The drill-shaft Gis provided at its forward end with a socket, G, toreceive the stein H of the drill-bit H, which is secured in said socketby the spring-pin H2. The drill-shaft is twisted its full length, so asto carry oft' the cuttings, and is provided with f openings G2 atvarious points along its length. In operation this shaft is placed inthe feedscrew, and is secured thereto by pin I, passed through hole Cand any one of the holes Gr2 which may be adjusted coincident thereto.This enables the adjustment of the drill-shaft out ofthe forward end ofthe screw, so as to vary its length as the hole is being bored, or forany other desired purpose.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s

The hereiirdescribed mining-machine, coinprising a threaded barreljonrnaled laterallyY in suitable supports, the hollow feed-screwprovided with ratchet-rings D D, set slightly apart, providing theintervening smooth bear` ing. D', the drill-shaft inserted through andtudinal adjustment therethrough, and the leof the levers, al1substantially as and for the vers E, having rings E, journaled on thebearpurposes set forth. 1o ings D1 and abn tted close together andagainst In testimony whereof I affix my signature in the oppositeratchet-rings D D, the pawls F presence of two Witnesses.

F, pivoted onthe opposite outer sides of the f HIRAM C. BURK. levers,with their points engaging the rateh- Vitnesses: et-rings D D, and thehandles projected later- E. J. HART, *f ally in opposite directionfrom-the outer ends J. A. SMITH.

